Fix x86/x86_64 expm1l inaccuracy and exceptions (bugs 13885, 13923).

1 files changed, 2 insertions, 89 deletions

diff --git a/sysdeps/i386/fpu/s_expm1l.S b/sysdeps/i386/fpu/s_expm1l.S
index e91f18b694..7fbd99b0db 100644
--- a/sysdeps/i386/fpu/s_expm1l.S
+++ b/sysdeps/i386/fpu/s_expm1l.S
@@ -1,89 +1,2 @@
-/* ix87 specific implementation of exp(x)-1.
-   Copyright (C) 1996-1997, 2002, 2005, 2008, 2012 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
-   Based on code by John C. Bowman <bowman@ipp-garching.mpg.de>.
-   Corrections by H.J. Lu (hjl@gnu.ai.mit.edu), 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-	/* Using: e^x - 1 = 2^(x * log2(e)) - 1 */
-
-#include <sysdep.h>
-#include <machine/asm.h>
-
-	.section .rodata
-
-	.align ALIGNARG(4)
-	ASM_TYPE_DIRECTIVE(minus1,@object)
-minus1:	.double -1.0
-	ASM_SIZE_DIRECTIVE(minus1)
-	ASM_TYPE_DIRECTIVE(one,@object)
-one:	.double 1.0
-	ASM_SIZE_DIRECTIVE(one)
-	ASM_TYPE_DIRECTIVE(l2e,@object)
-l2e:	.tfloat 1.442695040888963407359924681002
-	ASM_SIZE_DIRECTIVE(l2e)
-
-#ifdef PIC
-#define MO(op) op##@GOTOFF(%edx)
-#else
-#define MO(op) op
-#endif
-
-	.text
-ENTRY(__expm1l)
-	movzwl	4+8(%esp), %eax	// load sign bit and 15-bit exponent
-	xorb	$0x80, %ah	// invert sign bit (now 1 is "positive")
-	cmpl	$0xc006, %eax	// is num positive and exp >= 6 (number is >= 128.0)?
-	jae	HIDDEN_JUMPTARGET (__expl) // (if num is denormal, it is at least >= 64.0)
-
-	fldt	4(%esp)		// x
-	fxam			// Is NaN or +-Inf?
-	fstsw	%ax
-	movb	$0x45, %ch
-	andb	%ah, %ch
-	cmpb	$0x40, %ch
-	je	3f		// If +-0, jump.
-#ifdef	PIC
-	LOAD_PIC_REG (dx)
-#endif
-	cmpb	$0x05, %ch
-	je	2f		// If +-Inf, jump.
-
-	fldt	MO(l2e)		// log2(e) : x
-	fmulp			// log2(e)*x
-	fld	%st		// log2(e)*x : log2(e)*x
-	frndint			// int(log2(e)*x) : log2(e)*x
-	fsubr	%st, %st(1)	// int(log2(e)*x) : fract(log2(e)*x)
-	fxch			// fract(log2(e)*x) : int(log2(e)*x)
-	f2xm1			// 2^fract(log2(e)*x)-1 : int(log2(e)*x)
-	fscale			// 2^(log2(e)*x)-2^int(log2(e)*x) : int(log2(e)*x)
-	fxch			// int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x)
-	fldl	MO(one)		// 1 : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x)
-	fscale			// 2^int(log2(e)*x) : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x)
-	fsubrl	MO(one)		// 1-2^int(log2(e)*x) : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x)
-	fstp	%st(1)		// 1-2^int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x)
-	fsubrp	%st, %st(1)	// 2^(log2(e)*x)
-	ret
-
-2:	testl	$0x200, %eax	// Test sign.
-	jz	3f		// If positive, jump.
-	fstp	%st
-	fldl	MO(minus1)	// Set result to -1.0.
-3:	ret
-END(__expm1l)
-libm_hidden_def (__expm1l)
-weak_alias (__expm1l, expm1l)
+#define USE_AS_EXPM1L
+#include <e_expl.S>